#### julian403

##### Full Member level 5

\[\frac{1}{1 + j 2 \pi fCR}\]

But some book gives the following expression

\[ \frac{1}{1 + j \frac{f}{fc} }\]

Where fc it's the cutoff frequency.

if C[F] * R[Ω] =

What happends with \[2 \pi\]?

Because for me it would be

\[ \frac{1}{1 + j \frac{2 \pi f}{fc} }\]